How would you suggest to get ready for a horse show and what would be good for practice with an older horse that doesn't need to jump as often?

Jump the week before or a few days. Dont tire out your horse on the days running up to the comp, then on the night before just walk and stretch and try to get your horse nice and supple ( lots of leg yeilding and shoulder in will help ) if your horse is feeling good and isnt doing too many rounds at the comp then you can do a small gentle trot to get his muscles moving xx